The level of nitrogen oxides (NOX) and nonmethane organic gas (NMOG) in the exhaust over the useful life ( 150,000 miles of driving) of cars of a particular model varies Normally with mean 80 mg/mi and standard deviation 4 mg/mi. A company has 25 cars of this model in its fleet. Using Table A, find the level L such that the probability that the average NOX + NMOG level x for the fleet greater than L is only 0.01 ?